Set/Object creation performance depends on input data. #5
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In the context of getUniqueElement, it is hard to say that Set outperforms plain object.
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In your test, Set seems to outperform plain object since there was almost no collision when generating two sets before calculating similarity.
In the context of getUniqueElement, it is hard to say that Set outperforms
plain object, since the input data may have a lot of duplicates in it.